<h1>
this is a  dog。


</h1>
<h2>

This is a  dog.
</h2>

<h3>
this is a dog.
</h3>

<p>
this is a paragraph.
</p>

<p>
this is another paragraph
</p>

<a href="http://www.w3school.com.cn">
this is a link.


</a>

<img src=“w3hschool.jpg” width="104" height="142"/>